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The quality of a product is built by the company by paying attention to the needs and desires of customers because an industrial factory will not exist if the products made or ordered are not in accordance with consumer desires. This study aims to determine the causes of fabric defects, especially in one of the Alaska brands in April 2023 as many as 825 defect cases. This research uses the Fault Tree Analysis (FTA) method used to analyze the causes of production defects such as underfeed, double feed, and non-standard thickness. The results of the study were found several factors causing defects in less feed, double feed, and thickness not according to standards, namely raw materials, machinery, and human factors. The improvement strategies during the production process are. Strict supervision and control, periodic training, proper machine maintenance, and selection of quality raw materials are strategies implemented to minimize fabric defects. implement supporting infrastructure to reduce product growth rates.      

PG Madukismo is a sugar factory that was established in 1955 and is the only sugar factory in the province of the Special Region of Yogyakarta. This factory is located in Padokan Village, Tirtonirmolo Village, Kasihan District, Bantul Regency, Special Region of Yogyakarta. PT Madubaru, a company engaged in sugar cane processing, is a sugar and spirits factory located in the Yogyakarta area. Companies that produce cane sugar with SHS IA quality. Product defects are often found, resulting in a decrease in quality, therefore it is necessary to carry out quality control. This study uses the Failure Mode and Effect Analysis (FMEA) method to identify failure modes, Logic Tree Analysis (LTA) to determine the consequences of failure arising from failure modes and determine effective preventive maintenance policies for each machine. For the production quality control section, the Statistical Processing Control (SPC) method is used to analyze product defects to determine whether product defects are still within controllable limits or not. While the Failure Mode and Effect Analysis (FMEA) method is used to determine the failure mode in sugar production. For the quality control section on raw materials using the Economic Order Quantity (EOQ), Re-Order Point (ROP), Safety Stock (SS), and Total Inventory Cost (TIC) methods. The conclusion of this study is regarding the results of the analysis and calculations carried out with several settlement methods and there are several causes of production defects from 5 factors, such as: human factors, work methods, environment, raw materials and machines used. And provide solutions to companies in order to reduce defects by controlling product quality.